US20220021499A1 - Multiple transmission schemes in wireless communication - Google Patents

Multiple transmission schemes in wireless communication Download PDF

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Publication number
US20220021499A1
US20220021499A1 US17/401,972 US202117401972A US2022021499A1 US 20220021499 A1 US20220021499 A1 US 20220021499A1 US 202117401972 A US202117401972 A US 202117401972A US 2022021499 A1 US2022021499 A1 US 2022021499A1
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repetition
wireless communication
indicated
communication method
data
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Chuangxin JIANG
Zhaohua Lu
Yu Ngok Li
Shujuan Zhang
Zhen He
Bo Gao
Xinquan YE
Huahua Xiao
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J4/00—Combined time-division and frequency-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/189—Transmission or retransmission of more than one copy of a message
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/04—Arrangements for detecting or preventing errors in the information received by diversity reception using frequency diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated

Definitions

  • This patent document generally relates to systems, devices, and techniques for wireless communications.
  • Wireless communication technologies are moving the world toward an increasingly connected and networked society.
  • the rapid growth of wireless communications and advances in technology has led to greater demand for capacity and connectivity.
  • Other aspects, such as energy consumption, device cost, spectral efficiency, and latency are also important to meeting the needs of various communication scenarios.
  • next generation systems and wireless communication techniques need to provide support for an increased number of users and devices.
  • This document relates to methods, systems, and devices for multiple transmission schemes in wireless communication. Some implementations of the disclosed technology provide an improved flexibility to support more various scenarios while addressing signaling overhead.
  • a wireless communication method includes transmitting, by a first communication device, at least one of i) a repetition mode of data transmissions to be sent to a second communication device, ii) a mapping between N indicated beams and scheduled transmissions of the data, or iii) a RV (Redundant Version) relationship among the scheduled transmissions of the data, where the transmitting is based on at least one of the N indicated beam(s), a DMRS (Demodulation Reference Signals) port indication, or K time domain occasions, N and K being non-negative integers.
  • a DMRS Demodulation Reference Signals
  • a wireless communication apparatus comprising a processor configured to perform the disclosed methods is disclosed.
  • a computer readable medium having code stored thereon having code stored thereon.
  • the code when implemented by a processor, causes the processor to implement a method described in the present document.
  • FIG. 1 shows an example of a base station (BS) and a user equipment (UE) in wireless communication based on some implementations of the disclosed technology.
  • BS base station
  • UE user equipment
  • FIG. 2 shows an example of a block diagram of a portion of an apparatus based on some implementations of the disclosed technology.
  • FIG. 3 shows a conceptual diagram showing a multi-TRP (Transmit Receive Point) transmission scheme based on some implementations of the disclosed technology.
  • TRP Transmit Receive Point
  • FIG. 4 shows a conceptual diagram showing a multi-TRP transmission scheme to transmit a same data based on some implementations of the disclosed technology.
  • FIGS. 5 to 8 show examples of occupations of DMRS (Demodulation Reference Signals) resources based on some implementations of the disclosed technology.
  • DMRS Demodulation Reference Signals
  • FIG. 9 shows an example of a slot scheduling for FDM (Frequency Division Multiplexing) based on some implementations of the disclosed technology.
  • FIG. 10 shows an example of a multiple slot scheduling based on some implementations of the disclosed technology.
  • FIG. 11 shows an example of an intra-slot schedule based on some implementations of the disclosed technology.
  • FIG. 12 shows an example diagram of a multiple TRP transmission with a TDM (Time Division Multiplexing) repetition mode based on some implementations of the disclosed technology.
  • FIG. 13 shows an example of a diagram to divide scheduled PDSCH (Physical Data Shared Channel) repetitions based on some implementations of the disclosed technology.
  • PDSCH Physical Data Shared Channel
  • FIG. 14 shows an example of a flowchart of a multiple transmission scheme based on some implementations of the disclosed technology.
  • the disclosed technology may be used by implementations to provide multiple transmission schemes in wireless communication. Some implementations of the disclosed technology allow to achieve an improved flexibility to support more various scenarios while addressing signaling overhead. Also, some implementations of the disclosed technology can improve reliability of data transmitted.
  • DMRS port indication is used to indicate frequency resource partition, or the relationship of frequency resource portions, or the mapping between indicated TCI (Transmission Configuration Indicator) states and scheduled transmissions, or switch among the repetition modes.
  • TCI Transmission Configuration Indicator
  • the disclosed technology provides multiple transmission schemes in wireless communication which is possible to enhance reliability of data.
  • FIG. 1 shows an example of a wireless communication system (e.g., a 5G or NR cellular network) that includes a BS 120 and one or more user equipment (UE) 111 , 112 , 113 .
  • the UEs access the BS (e.g., the network) using implementations of the disclosed technology ( 131 , 132 , 133 ), which then enables subsequent communication ( 141 , 142 , 143 ) from the BS to the UEs.
  • the UE may be, for example, a smartphone, a tablet, a mobile computer, a machine to machine (M2M) device, an Internet of Things (IoT) device, and so on.
  • M2M machine to machine
  • IoT Internet of Things
  • FIG. 2 shows an example of a block diagram representation of a portion of an apparatus.
  • An apparatus 210 such as a base station or a wireless device (or UE) can include processor electronics 220 such as a microprocessor that implements one or more of the techniques presented in this document.
  • the apparatus 210 can include transceiver electronics 230 to send and/or receive wireless signals over one or more communication interfaces such as antenna 240 .
  • the apparatus 210 can include other communication interfaces for transmitting and receiving data.
  • the apparatus 210 can include one or more memories (not explicitly shown) configured to store information such as data and/or instructions.
  • the processor electronics 220 can include at least a portion of transceiver electronics 230 . In some embodiments, at least some of the disclosed techniques, modules or functions are implemented using the apparatus 210 .
  • FIG. 3 shows a conceptual diagram showing a multi-TRP transmission scheme.
  • multiple TRPs including a first TRP (TRP 0) and a second TRP (TRP 1) transmit data to a same user.
  • the serving cell of the UE which is assumed to be the first TRP, can send a PDCCH (Physical Downlink Control Channel) to schedule multiple data streams, for example, multiple transmission layers, for sending data streams.
  • PDCCH Physical Downlink Control Channel
  • Multiple transmission layers can be sent by each of the first TRP and the second TRP.
  • a DCI format sent by the first TRP schedules four transmission layers for the data transmission which correspond to four DMRS ports.
  • the two layers of the four transmission layers can be from the first TRP, and the remaining two layers of the four transmission layers can be from the second TRP.
  • the R15 solution can support multiple TRP transmissions without major changes, because two cooperative TRPs can dynamically interact, and the control channel is sent mainly by the serving cell.
  • FIG. 4 shows a conceptual diagram showing a multi-TRP transmission scheme to transmit a same data.
  • the first TRP (TRP0) and the second TRP (TRP 1) transmit a same data (TB0).
  • TRP0 the first TRP
  • TRP 1 the second TRP
  • TRP 2 transmit a same data
  • TRP 1 the repetition of the data occurs since the same data is transmitted twice from the two TRPs including the first TRP and the second TRP.
  • FIGS. 5 to 8 show occupations of DMRS resources.
  • the occupations as shown in FIGS. 5 and 6 support the DMRS type 1 and the occupation as shown in FIGS. 7 and 8 support the DMRS type 2.
  • DMRS type 1 all DMRS ports are divided into two CDM (Code Division Multiplexing) groups.
  • the DMRS ports in each CDM group occupy a same time-frequency resources and are distinguished by different OCC (Orthogonal Cover Codes) codes.
  • OCC Orthogonal Cover Codes
  • the DMRS ports of multiple TRPs are divided into multiple DMRS port groups, and the DMRS ports of different DMRS port groups are mapped on different CDM groups.
  • transmission layers from multiple TRP are independent for users of the eMBB (Enhanced Mobile Broadband) service or the good channel conditions for the URLLC service.
  • eMBB Enhanced Mobile Broadband
  • the total number of layers of multiple TRP transmissions is less than or equal to four, then a total of one TB is transmitted, and multiple layers corresponding to the TB may be from different TRPs. If the total number of layers is greater than four, then two TBs may be transmitted.
  • multiple TRPs preferably transmit one TB separately.
  • the TBs of the multiple TRP transmissions may be same or related to each other.
  • the RV versions of multiple TBs may be different in order to allow different redundancy versions to be merged at the UE side.
  • layers belong to one TB but from different TRPs can be related or the same.
  • a single PDCCH schedules two layer groups or two TBs which are transmitted from two TRPs. In order to keep a same DCI format size, these two layer groups or two TBs can be allocated with the same time and frequency resources. Although the two transmissions are on the same PRBs, they can be indicated with different DMRS port groups which map on different CDM groups, and the orthogonality can be achieved at least for DMRS. Then the interference between these two transmissions can be mitigated.
  • This repetition scheme is denoted as SDM (spatial division multiplexing) repetition in which two layer groups carry the same TB, and the two TBs are mapped on the same time and frequency resources, wherein one layer corresponds to one DMRS port.
  • SDM spatial division multiplexing
  • the same TB is transmitted twice on different DMRS ports. Since two TRPs have different locations, two TCI states may be indicated for those two transmissions or two DMRS port groups. In this case, two transmissions of data correspond to two repetitions wherein DMRS ports of two transmissions are mapped on different CDM groups.
  • FIG. 9 shows an example of a slot scheduling for FDM.
  • one single PDCCH schedules one PDSCH which includes two frequency parts corresponding to two indicated TCI states, respectively.
  • the frequency part 1 is from one of two TRPs and the frequency part 2 is from the other one of the two TRPs.
  • two transmissions of data correspond to two repetitions which map on two non-overlapping frequency resource parts.
  • multiple PDSCH scheduling by single PDCCH to transmit the same TB can be supported as Rel-15 solution wherein the same symbol allocation is applied across the pdsch-AggregationFactor consecutive slots.
  • Rel-15 only one TCI state is indicated for pdsch-AggregationFactor consecutive slots as shown in FIG. 10 which shows an example for a multiple slot scheduling.
  • FIG. 11 shows an example for an intra-slot schedule. As shown in FIG. 11 , each PDSCH may only be mapped on few OFDM symbols. Furthermore, inter-slot PDSCH repetition can be combined, i.e. one single PDCCH schedules K PDSCH repetitions across multiple slots wherein one slot may include more than one PDSCH repetition.
  • multiple TCI states can be indicated by PDCCH for the multiple PDSCH scheduling.
  • This multiple slot scheduling for the same TB transmission is denoted as TDM repetition.
  • the number of PDSCH occasion in the time domain scheduled by the single PDCCH is denoted as K. Since K repetitions are not mapped on the overlapping resources, the same DMRS port(s) can be indicated for the K repetitions.
  • the number of K can be configured by a RRC (Radio Resource Control) signaling to the UE.
  • K can be implicitly or explicitly indicated by a DCI.
  • K transmissions of data corresponds to K repetitions which are mapped on K non-overlapping time domain occasions.
  • each of the SDM repetition and the FDM repetition can be combined with the TDM repetition.
  • the total number of repetitions including in spatial domain, or frequency domain, or time domain may be greater than K. For instance, total 2K repetitions are received by UE if two FDM repetitions and K TDM repetitions are used.
  • the number of the actual repetitions may be dynamically changed which depends on the value K and based on a repetition mode, for example, whether the SDM repetition and/or the FDM repetition is used. Denoting the number of TCI states or QCL RS sets indicated by the TCI codepoint in DCI as N. To reduce standard effort and signaling overhead, the candidates of value N may be limited, e.g. 1 or 2. If the number of total repetitions does not match N, the mapping between N indicated TCI states or N QCL RS sets and transmissions of data may be informed to the UE. In some implementations, the repetition mode may also be informed to the UE.
  • Some rules or signaling may need to be defined.
  • Some implementations for the techniques to inform the UE are based on the DMRS port indication (‘Antenna port(s)’ field in DCI), N indicated TCI states, and value K.
  • N can also be assumed as 1.
  • N TCI states or QCL RS sets mean N different TCI states or QCL RS sets.
  • Table 1 An example of a DMRS indication table, Table 1, is shown.
  • the TDM repetition may be selected as shown in rows with values 0 to 3
  • the SDM repetition may be selected as shown in rows with values 4 and 5
  • the FDM repetition may be selected as shown in rows with value 6 to 9.
  • multiple TRP transmission or single TRP transmission can be dynamically changed based on various channel conditions.
  • the TDM repetition may be dynamically selected as shown in rows with value 0 to 3 in Table 1.
  • a single TRP transmission is used and there is only one repetition in one time domain occasion.
  • only one DMRS port is enough because of the single layer and the single TRP transmission. Therefore, one TCI is for one slot.
  • the TCI states for four time domain repetitions can include TCI 0, TCI 0, TCI 1, TCI 1, respectively.
  • N TCI states are used for K time domain repetitions.
  • TCI index i within the indicated TCI states for slot k can be determined by Equation 1:
  • TCI index i within the indicated TCI states for slot k can be determined by Equation 2:
  • N TCI states are used for N consecutive repetitions and cycling. Even if more than 1 DMRS ports are allocated, all DMRS ports correspond to the same TCI in one slot.
  • the indicated four TCI states for four time domain occasions can include (TCI 0, TCI 1), (TCI 0, TCI 1), (TCI 2, TCI 3), (TCI 2, TCI 3), respectively. In this case, total 2K transmissions or repetitions are scheduled. In each time domain occasion, two repetitions based on the FDM are used.
  • the indicated TCI states for slot k can be indicated by Equation 3:
  • TCI i and i+1 for the first frequency resource part and the second frequency resource part respectability which respectively correspond to the first repetition and the second repetition in time domain occasion k.
  • N TCI states are divided into N/2 groups, two consecutive TCI states are one group.
  • N/2 TCI groups are used for N/2 blocks in order.
  • the first TCI is for the first frequency resource part and the second TCI is for the second frequency resource part.
  • the indicated four TCI states for four time domain occasions can include (TCI 0, TCI 1), (TCI 2, TCI 3), (TCI 0, TCI1), (TCI 2, TCI 3), respectively.
  • the indicated TCI states for slot k can be indicated by Equation 4:
  • N TCI states are divided into N/2 groups, two consecutive TCI states are one group.
  • N/2 TCI groups are used for K occasions and cycling.
  • the same DMRS ports can be used for the two frequency parts.
  • SDM is used, then two TCI states are needed in one time domain occasion for the two DMRS port groups.
  • DMRS ports from the two TRPs may be mapped on different CDM groups, as shown in rows with value 4 and 5 in Table 1.
  • the indicated four TCI states for 4 time domain occasions can include (TCI 0, TCI 1), (TCI 0, TCI 1), (TCI 2, TCI 3), (TCI 2, TCI 3), respectively. In this case, total 2K transmissions or repetitions are scheduled.
  • TCI states for slot k can be indicated by Equation 5:
  • TCI i is for the DMRS ports within the first allocated CDM group and TCI i+1 is for the DMRS ports in the remaining CDM group(s), vice versa.
  • K repetitions are divided into N/2 blocks, each N/2 block including 2M time domain occasions.
  • N TCI states are divided into N/2 groups and two consecutive TCI states are one group.
  • N/2 TCI groups are used for N/2 blocks in order.
  • the first TCI is for the DMRS ports within the first allocated CDM group and the second TCI is for the DMRS ports in the remaining CDM group(s).
  • the indicated four TCI states for four time domain occasions can be (TCI 0, TCI1), (TCI 2, TCI3), (TCI 0, TCI1), (TCI 2, TCI3), respectively, as same as FDM case. Since two TRPs transmit data on overlapping resources, multiple DMRS ports from two TRPs map on different CDM groups should be allocated to UE for SDM repetition.
  • the DMRS port indication may be used to distinguish the specific repetition scheme or mode. As shown in Table 1, although the value 0 and value 6 informs the same DMRS port information, the value 0 and value 6 indicate the TDM repetition mode and the combined mode of the FDM repetition and the TDM repetition, respectively, in the same time domain occasion. If multiple DMRS ports are allocated and mapped on multiple CDM groups, the repetition scheme is based on the combined mode of the SDM repetition and the TDM repetition. In some implementations, the DMRS port indication is also used to indicate the mapping between N indicated TCI states and the scheduling repetitions.
  • the DMRS port indication is also used to indicate the mapping between N indicated TCI states and indicated DMRS port(s) for SDM, or between N indicated TCI states and frequency parts for FDM, or between N indicated TCI states and time domain occasions for TDM.
  • the repetition mode, the mapping between N indicated TCI states and the scheduling repetitions can be achieved.
  • some entries carry the same DMRS port information with different repetition modes.
  • some entries can carry the same DMRS port information with different mapping relationships between the indicated TCI states and the scheduling repetitions.
  • some entries can carry the same DMRS port information with different mapping relationships between the indicated TCI states and DMRS ports.
  • some entries can carry the same DMRS port information with different mapping relationships between the indicated TCI states and frequency resource parts. Consequently, it can be regarded as a joint encoding among DMRS port information, repetition modes and the mapping relationship.
  • entries with values 0 to 3 correspond to repetition mode TDM only.
  • all DMRS ports and all frequency resources correspond to one TCI state.
  • entries with values 4 and 5 correspond to the combined mode of the SDM repetition and the TDM repetition, i.e., SDM+TDM repetition mode.
  • the DMRS ports within one allocated CDM group correspond to one TCI state
  • other DMRS ports correspond to another TCI state
  • the DMRS ports within the first or last allocated CDM group correspond to one TCI state
  • other DMRS ports correspond to another TCI state.
  • the two layer groups are SDM repetitions on the completely overlapping resources. Entries with value 6-9 correspond to the combined mode of the FDM repetition and the TDM repetition, i.e., FDM+TDM repetition mode.
  • Two TCI states are used for frequency resource part 1 and 2, respectively.
  • the DMRS ports are same for the two frequency resource parts 1 and 2. Since maybe only one MCS field is configured in DCI, two frequency resource parts can be predefined with the same number of PRBs, e.g. the allocated PRBs are equally divided into two frequency resource parts 1 and 2, and the same MCS.
  • TCI mapping pattern can also be indicated by DMRS port indication, e. g., joint encoding between DMRS port information and TCI mapping pattern.
  • Table 1 is an example with one layer limitation per each TRP and various modifications can be applied to the DMRS indication table.
  • some parameters related K e.g. the number of time domain occasions within one slot, or the value of K can also be indicated by DMRS port indication or by some bits of DMRS port indication field in DCI since there are many reserved entries.
  • entries with values 0 to 8 correspond to the TDM repetition mode only.
  • all DMRS ports and all frequency resources only correspond to one TCI state.
  • Entries with values 9 to 11 correspond to the combined SDM+TDM repetition mode.
  • the DMRS ports within one CDM group correspond to one TCI state
  • other DMRS ports correspond to another TCI state.
  • PDSCH streams or layers corresponding to first TCI state and other PDSCH streams or layers corresponding to second TCI state carry a same TB.
  • the two layer groups are SDM repetitions on the completely overlapping resources. Comparing entries with values 8 and 9 to each other, the entries with values 8 and 9 carry a same DMRS port information but represent different repetition mode and the mapping relationship.
  • Entries with values 12 to 20 correspond to the combined FDM+TDM repetition mode.
  • Two TCI states are used for frequency resource parts 1 and 2, respectively.
  • the implementations 1 and 2 have been discussed with the assumption that the FDM repetition mode, the TDM repetition mode, the SDM repetition mode, the combined repetition modes are supported. However, it is also possible that only some of the repetition modes are supported. For instance, only three modes, e.g., the TDM repetition mode, the SDM repetition mode, and the combined TDM+SDM repetition mode can be supported. In this case, some entries for indicating FDM or FDM+TDM in Tables can become unnecessary. In some implementations, an additional repetition mode can be supported. In this case, two TCI states are used for the same DMRS port(s). For example, two TRPs transmit a same TB with different beams or different TCI states but on the same DMRS port(s).
  • TDM repetition mode will not be used.
  • the repetition modes may include FDM repetition and SDM repetition.
  • the repetition mode can also include a non-repetition, i.e. a single TRP transmission or transmission without repetition or transmission without SDM, FDM and TDM or it can be assumed as only one repetition for the data transmission.
  • a non-repetition mode all DMRS ports and all allocated frequency resources correspond to the same TCI state. If N TCI states are configured wherein N is greater than 1, for the non-repetition mode, the first one of N TCI states may be used. In Table 3 as shown below, N is assumed as two.
  • the first TCI state 1 2 0 2 2 2 0,1 1 3 2 0,1 2 4 2 0,1,2 1 5 2 0,1,4 2 6 2 0,1,2,3 1 7 2 0,1,4,5 2 8 2 0,2 1 9 2 0,2 1
  • the first TCI sate is for DMRS port(s) in the first CDM 10 2 0,2 2 group; 11 2 0,1,2,3 1
  • the second TCI state is for DMRS port(s) in other CDM groups 12 2 0 1
  • the first TCI sate is for the first frequency resource part; 13 2 0 2
  • the second TCI sate is for the second frequency resource 14 2 0,1 1 part; 15 2 0,1 2 16 2 0,1,2 1 17 2 0,1,4 2
  • N is always 1 in Rel-15 for both single slot scheduling and multiple slot scheduling.
  • separate DMRS port indication tables may be used for cases with different N values.
  • the DCI format can be kept as the same as Rel-15.
  • the DMRS port indication field is only to indicate DMRS port information same as in Rel-15.
  • some bits of the DMRS port indication field indicate the repetition mode, TCI mapping pattern, and the mapping between TCI states, DMRS ports and frequency resources. The remaining bits can still be used to indicate DMRS port indication.
  • the joint encoding among the DMRS port indication, the repetition mode, and the mapping relationship can be used when N>1 as described in Implementation 1.
  • RV redundancy version
  • FIG. 12 shows an example diagram of a multiple TRP transmission with a TDM repetition mode.
  • N is greater than 1.
  • TCI state 0 and TCI state 1 are used for the PDSCH occasion 0 and the PDSCH occasion 1, respectively. If rvid indicated by the DCI is equal to 0, then the actual rvid for the two occasions are 0, 2 respectively. based on Table 5.
  • one of transmission paths e.g., a link between the UE and TRP 0, can be blocked by, for example, a human body. In this case, the second occasion can still be received by the UE based on TCI state 1.
  • one TCI state can correspond to one TRP or one beam transmission. Therefore, the predefined relationship in Table 5 can still be reused for repetitions with the same TCI state. In some implementations, some new predefined relationship among the first rvid of each TCI state can be defined.
  • all scheduled PDSCH repetitions can be divided into N groups and PDSCH repetitions within a group are associated with a same TCI state.
  • the rvid indicated by the DCI is for one of e.g. the first repetition of the first group.
  • a new predefined relationship is set up among the rvid of first repetition of the first group and the rvid of first repetition of the other groups.
  • a new predefined relationship is set up among the rvid of one repetition of the first group and the rvid of one repetition of the other groups.
  • the repetition order is ascending in time domain.
  • the group order is ascending in frequency domain first, and then in time domain for the FDM repetition mode.
  • the group order is ascending in spatial domain first, and then in time domain.
  • FIG. 13 shows an example of a diagram to divide scheduled PDSCH repetitions.
  • the combined FDM+TDM repetition mode is indicated.
  • all eight repetitions are divided into two groups, repetition 00, 01, 02 and 03 use TCI state 0 within group 0, repetition 10, 11, 12 and 13 use TCI state 1 within group 1.
  • the detailed rvid is shown in Tables 7 and 8.
  • the two groups correspond to different CDM groups.
  • RV rules can work well in the high frequency band.
  • the repetition order is ascending in spatial domain or frequency domain first, and then in time domain.
  • the rule can be based on Table 5 with modification of k which is the repetition index within all repetitions including all domains.
  • k is the repetition index within all repetitions including all domains.
  • some implementations introduce one RRC signaling to turn on or turn off the group-based solution.
  • the RRC signaling is to switch between only one group and N groups.
  • whether to be one group or N groups depends on the frequency bands. In FR1 (frequency range 1, i.e. sub-6 GHz), one group is used. In FR2, N group is used.
  • a current DCI there is only one ‘frequency domain resource assignment’ field in the DCI in order to indicate or inform the UE the frequency resources, e.g. which PRBs or RBGs are allocated. If the FDM repetition mode in indicated, two TCI states are used for two frequency resource parts as described above.
  • One approach to inform the UE the two frequency resource parts may be to add one more ‘frequency domain resource assignment’ field in the DCI. In this case, two fields indicate two frequency resource parts respectively, which will lead to increase the DCI size and cause less PDCCH capacity.
  • Another approach to inform the UE the two frequency resource parts may be to predefine the relationship between the frequency resource parts. Since the same TB is transmitted twice in the two frequency resource parts, i.e. TBS is the same in the two parts, the two frequency resource parts can be assumed with the same number of PRBs or RBGs. MCS can also be assumed the same. In this case, the same TBS can be guaranteed. For instance, X RBGs or PRBs are allocated to the UE by the ‘frequency domain resource assignment’ field in the DCI, then the first X/2 RBGs or PRBs are allocated for the first frequency resource part, and the remaining RBGs or PRBs are for the second frequency resource part. This approach can make a simpler UE implementation especially when only one MCS field is configured in the DCI. If X/2 is not integer,
  • RBGs or PRBs are allocated for the first frequency resource part, and the remaining RBGs or PRBs are for the second frequency resource part.
  • the transmission efficiency is not high in the case when channel conditions from two TRPs are very different. If SINR between TRP 0 and the UE is much higher than that between TRP 1 to UE, gNB can allocate less PRBs or RBGs for the first frequency resource part than the second frequency resource part. This is because less PRBs are needed to carry the same TB for the first frequency resource part.
  • Two MCS fields can be configured in DCI.
  • the two MCS fields can be used for the two frequency resource parts. Since larger MCS value means higher channel SINR, the larger MCS value is indicated, the less PRBs or RBGs can be assumed.
  • the number of PRB or RBGs for each of the frequency resource parts is based on the indicated MCS. For instance, the number of RBGs or PRBs for the first frequency resource part can be obtained by Equation 6:
  • R 1 , Q 1 and v 1 represent a code rate, a modulation order, and the number of DMRS ports for the first frequency resource part, respectively
  • R 2 , Q 2 and v 2 represent a code rate, a modulation order, and the number of DMRS ports for the second frequency resource part.
  • the code rate and the modulation order are based on indicated MCS.
  • entries with values 0 to 3 are the same as the legacy ones when two MCS fields exist in the DCI and both two CWs are enabled. In this case, more entries, e.g. entries with values 4 to 7 are added to indicate the repetition mode.
  • NR Rel-15 supports multiple slot scheduling as shown in FIG. 10 , and the same symbol allocation is applied across the pdsch-AggregationFactor (it can be denoted as K1) consecutive slots.
  • the pdsch-AggregationFactor is configured by RRC signaling. Intra-slot multiple PDSCH repetition as shown in FIG. 11 is not supported in Rel-15.
  • the PDSCH mapping has two types which are mapping type A and type B respectively.
  • mapping type A the first DMRS of the PDSCH may be symbol 2 or 3 of one slot and then intra-slot multiple PDSCH repetition may not work well since each repetition needs its DMRS in a case that TCI states are different.
  • mapping type B another intra-slot aggregation factor (it can be denoted as K2) can be introduced, and the value can be greater than 1. Then, the total K across intra or inter slots are K1*K2. Within one slot, K2 repetitions need to be consecutive for simplicity. In different slots, PDSCH locations are the same for each slot. In brief, two repetition factors are supported, one is the number inter-slot repetition as Rel-15, the other is number of intra-slot repetitions.
  • RRC signaling can be used to configure the number of K2, but the actual number needs to be based on available OFDM symbols within each slot.
  • the next repetition will not be transmitted.
  • the FDM repetition mode and the SDM repetition mode are introduced above.
  • the FDM repetition mode two TRPs transmit two parts of data in two non-overlapping frequency parts.
  • the SDM repetition mode two TRPs transmit two parts of data in complete overlapping resource. It is noted that two parts of data can be different if the repetition is not used.
  • the UE can report its capability to indicate gNB whether it supports partial overlapping resource scheduling. It is noted that two resources can be scheduled by two PDCCHs. Then, the UE may report its capability to indicate gNB whether it supports partial overlapping resources scheduled by two PDCCHs.
  • two TCI states corresponding to two TRPs can be used for the same DMRS port(s) but with different DMRS sequences, e.g. the same orthogonal DMRS port(s) but with different nSCID.
  • DMRS from two TRPs are not orthogonal, some UEs with higher capability can still correctly detect the DMRS, for example, depending on UE capability. Therefore, the UE can report its capability to indicate gNB whether it supports two TCI corresponding to the same DMRS port(s). The UE can report its capability to indicate gNB whether it supports two TCI corresponding to the same DMRS port(s) but with different DMRS sequences.
  • DL downlink
  • UL uplink
  • the UE may have two panels, and the same TB can also be transmitted from the two panels.
  • the beam information is indicated by a parameter of spatial relation information or SRS resource or SRS resource set instead of TCI state.
  • N is the number of the RS in spatial relation information, or the number of spatial relation information, or the number of indicated SRS resources, or the number of indicated SRS resource sets.
  • SRS resource(s) or resource set(s) are usually indicated by SRI(s) in DCI.
  • FIG. 14 shows an example of a flowchart of a multiple transmission scheme based on some implementations of the disclosed technology.
  • the example of the multiple transmission scheme includes transmitting, by a first communication device, at least one of i) a repetition mode of data transmissions to be sent to a second communication device, ii) a mapping between N indicated beams and scheduled transmissions of the data, or iii) a RV (Redundant Version) relationship among the scheduled transmissions of the data.
  • the transmitting is based on at least one of the N indicated beam(s), a DMRS (Demodulation Reference Signals) port indication, or K time domain occasions, wherein N and K are non-negative integers.
  • DMRS Demodulation Reference Signals
  • a wireless communication method including: transmitting, by a first communication device, at least one of i) a repetition mode of data transmissions to be sent to a second communication device, ii) a mapping between N indicated beams and scheduled transmissions of the data, or iii) a RV (Redundant Version) relationship among the scheduled transmissions of the data, wherein the transmitting is based on at least one of the N indicated beam(s), a DMRS (Demodulation Reference Signals) port indication, or K time domain occasions, N and K being non-negative integers.
  • DMRS Demodulation Reference Signals
  • one of the N indicated beams represents a TCI (Transmission Configuration Indicator) state indicated by a DCI (Downlink Control Information), a SRS (Sounding Reference Signal) resource or resource set indicated by an SRI (Scheduling Request Indicator), or a RS (Reference Signal) indicated by a spatial-relation-information.
  • TCI Transmission Configuration Indicator
  • DCI Downlink Control Information
  • SRS Sounding Reference Signal
  • SRI Service Request Indicator
  • RS Reference Signal
  • the repetition mode includes a FDM (Frequency Division Multiplexing) repetition mode in which the data is transmitted on at least two resource parts in frequency domain.
  • FDM Frequency Division Multiplexing
  • the repetition mode includes a TDM (Time Division Multiplexing) repetition mode in which the data is transmitted on at least two occasions in time domain.
  • TDM Time Division Multiplexing
  • the repetition mode includes a SDM (Spatial Division Multiplexing) repetition mode in which the data is transmitted on a same time and a same frequency but associated with different DMRS ports.
  • SDM Spatial Division Multiplexing
  • the repetition mode includes a non-repetition mode in which the data is transmitted without repetition.
  • k is from 0 to K ⁇ 1.
  • k is from 0 to K ⁇ 1.
  • the beam i is used for indicated DMRS port(s) within a first allocated CDM (Code Division Multiplexing) group which corresponds to a first repetition in the time domain occasion k and the beam i+1 is used for other indicated DMRS port(s) which corresponds to a second repetition in the time domain occasion k.
  • CDM Code Division Multiplexing
  • T has a value which is equal to 1 or N depending on a RRC (Radio Resource Control) signaling or frequency bands.
  • RRC Radio Resource Control
  • a wireless communications apparatus comprising a processor and a memory, wherein the processor is configured to read code from the memory and implement a method recited in any of clauses 1 to 22.
  • a computer program product comprising a computer-readable program medium code stored thereupon, the code, when executed by a processor, causing the processor to implement a method recited in any of clauses 1 to 22.
  • a computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM), Random Access Memory (RAM), compact discs (CDs), digital versatile discs (DVD), etc. Therefore, the computer-readable media can include a non-transitory storage media.
  • program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types.
  • Computer- or processor-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.
  • a hardware circuit implementation can include discrete analog and/or digital components that are, for example, integrated as part of a printed circuit board.
  • the disclosed components or modules can be implemented as an Application Specific Integrated Circuit (ASIC) and/or as a Field Programmable Gate Array (FPGA) device.
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • DSP digital signal processor
  • the various components or sub-components within each module may be implemented in software, hardware or firmware.
  • the connectivity between the modules and/or components within the modules may be provided using any one of the connectivity methods and media that is known in the art, including, but not limited to, communications over the Internet, wired, or wireless networks using the appropriate protocols.

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US20200389897A1 (en) * 2019-08-16 2020-12-10 Bishwarup Mondal Pucch and pdsch in multiplexed nr applications
US20210144720A1 (en) * 2019-11-07 2021-05-13 Comcast Cable Communications, Llc Transmission repetition for wireless communication
US20210184738A1 (en) * 2019-12-16 2021-06-17 Qualcomm Incorporated Indication to update uplink and downlink beams
US20210298062A1 (en) * 2020-03-23 2021-09-23 Qualcomm Incorporated Two-stage feedback procedures for multiple downlink transmissions
US20220200758A1 (en) * 2019-04-30 2022-06-23 Datang Mobile Communications Equipment Co., Ltd. Method for receiving information, method for sending information, terminal and network device

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WO2020191761A1 (zh) * 2019-03-28 2020-10-01 Oppo广东移动通信有限公司 数据的传输方法、装置、设备及存储介质
JP7354302B2 (ja) * 2019-07-25 2023-10-02 オッポ広東移動通信有限公司 データを伝送するための方法及び端末装置
WO2021030954A1 (zh) * 2019-08-16 2021-02-25 华为技术有限公司 传输模式确定方法及装置
CN116368764A (zh) 2020-10-02 2023-06-30 苹果公司 改进具有高多普勒漂移的网络多输入多输出(mimo)性能

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CN107005376B (zh) * 2014-09-15 2020-08-28 诺基亚技术有限公司 用于单载波传输的下行链路控制信道的方法和装置
CN113839760B (zh) * 2015-09-25 2023-03-28 中兴通讯股份有限公司 数据传输方法和节点
US10499342B2 (en) * 2016-07-05 2019-12-03 Lg Electronics Inc. Method of controlling transmit power of uplink channel in wireless communication system and apparatus therefor
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US20220200758A1 (en) * 2019-04-30 2022-06-23 Datang Mobile Communications Equipment Co., Ltd. Method for receiving information, method for sending information, terminal and network device
US11979355B2 (en) * 2019-04-30 2024-05-07 Datang Mobile Communications Equipment Co., Ltd. Method for receiving information, method for sending information, terminal and network device
US20200389897A1 (en) * 2019-08-16 2020-12-10 Bishwarup Mondal Pucch and pdsch in multiplexed nr applications
US11930479B2 (en) * 2019-08-16 2024-03-12 Intel Corporation PUCCH and PDSCH in multiplexed NR applications
US20210144720A1 (en) * 2019-11-07 2021-05-13 Comcast Cable Communications, Llc Transmission repetition for wireless communication
US11729803B2 (en) * 2019-11-07 2023-08-15 Comcast Cable Communications, Llc Transmission repetition for wireless communication
US20210184738A1 (en) * 2019-12-16 2021-06-17 Qualcomm Incorporated Indication to update uplink and downlink beams
US20210298062A1 (en) * 2020-03-23 2021-09-23 Qualcomm Incorporated Two-stage feedback procedures for multiple downlink transmissions

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